Malicious PDF — malware analysis report

Static analysis result for SHA-256 d260a21acb8b2a21…

MALICIOUS

PDF

95.2 KB Created: 2021-04-04 22:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7e16d76d6ce1bcc8b7c117a938cc3d1d SHA-1: 33c13a1f855fa7e2d6a63707c9212b4eba9ae588 SHA-256: d260a21acb8b2a21cf66cf8b91b3c341458eb55cd300b8387b6dd1462f455c7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/123?utm_term=annual+physical+exam+format PDF link annotation
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/2700528.pdfIn PDF document text
    • http://arfeshome.com/blue_background_hd_photo4jvx7.pdfIn PDF document text
    • http://pizidojokinesa.66ghz.com/descargar_diccionario_biblico_hebreo_espaol_gratis.pdfIn PDF document text
    • http://lavkavkusa.store/arsenal_man_utd_match_reportfxm8i.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/18cf8.pdfIn PDF document text
    • http://idealica-italiaoficial.site/how_to_calculate_the_volume_of_a_cylinder_in_literskhksr.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/66126950052rl7kg.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/3f58292c.pdfIn PDF document text
    • http://virnet77.ru/when_lights_are_low_benny_carterrzg3u.pdfIn PDF document text
    • http://fudopajir.iblogger.org/pusurotelapepukegis.pdfIn PDF document text
    • https://vilekelapufixev.weebly.com/uploads/1/3/4/5/134508089/tamapozelawipev.pdfIn PDF document text
    • http://unonatur.space/sibimopedalizouxtag.pdfIn PDF document text
    • http://myluckybet.xyz/61694528143idul5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/fogefokunatazodolesafabip.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/android_studio_change_app_version.pdfIn PDF document text
    • http://tofezaniv.rf.gd/balancing_chemical_equations_worksheet_25_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/dofovoxugetixa.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/pewomakat.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/mexomodixunetovatufodafor.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/kirby_sentria_2_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/itunes_12._10.pdfIn PDF document text
    • http://zosuvupetod.epizy.com/7537814455.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/activex_hosting_plugin_for_firefox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 5412 bytes
SHA-256: e7c27a1f0d3d644d7b3cfc8fd48c23682a76d79ed8b12b7d15e8b6e010e6294f
font_01_sfnt_off000145ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EA 11800 bytes
SHA-256: 6d8f3ccd87686dd579cecdc58459901b6fd2daabac97751d21b5c4428270a70d

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